背景类源代码：CClockBackground::~CClockBackground(){}voidCClockBackground::Draw(CDC*pDC){CPenpenMain(PS_SOLID,1,m_crMain),penOther(PS_SOLID,1,m_crOther);CBrushbrMain(m_crMain),brOther(m_crOther);CPen*pOldPen=pDC->SelectObject(&penOther);CBrush*pOldBrush=pDC->SelectObject(&brMain);CPointptCe